Ocean Science
www.ocean-sci.net
1812-0784
1812-0792
5
3
2009
10.5194/os-5-235-2009
http://www.ocean-sci.net/5/235/2009/
http://www.ocean-sci.net/5/235/2009/os-5-235-2009.html
http://www.ocean-sci.net/5/235/2009/os-5-235-2009.pdf
235
246
2009-07-07
Thermodynamic properties of standard seawater: extensions to high temperatures and pressures
J. Safarov
javid.safarov@uni-rostock.de
F. Millero
R. Feistel
A. Heintz
E. Hassel
Lehrstuhl für Technische Thermodynamik, Universität Rostock, Albert-Einstein-Str. 2, 18059, Rostock, Germany
Department of Heat and Refrigeration Techniques, Azerbaijan Technical University, H. Javid Avn. 25, AZ1073 Baku, Azerbaijan
Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, 33149, Miami, FL, USA
Sektion Physikalische Ozeanographie und Messtechnik, Leibniz-Institut für Ostseeforschung, Seestr. 15, 18119 Warnemünde, Germany
Abteilung für Physikalische Chemie, Universität Rostock, Hermannstr. 14, 18051, Rostock, Germany
Measurements of (<i>p, ρ, T</i>) properties of standard seawater with
practical salinity <i>S</i>≈35, temperature <i>T</i>=(273.14 to 468.06) K
and pressures, <i>p</i>, up to 140 MPa are reported with the reproducibility of
the density measurements observed to be in the average percent deviation
range Δρ/ρ=±(0.01 to 0.03)%. The measurements are made with a newly constructed vibration-tube
densimeter which is calibrated using double-distilled water, methanol and
aqueous NaCl solutions. Based on these and previous measurements, an
empirical expression for the density of standard seawater has been developed
as a function of pressure and temperature. This equation is used to calculate
other volumetric properties including isothermal compressibility, isobaric
thermal expansibility, differences in isobaric and isochoric heat capacities,
the thermal pressure coefficient, internal pressure and the secant bulk
modulus. The results can be used to extend the present equation of state of
seawater to higher temperatures for pressure up to 140 MPa.
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